Add occlusion support to WebContentsImpl and RenderWidgetHostView

content/public/browser/render_widget_host_view.h

Index: content/public/browser/render_widget_host_view.h
diff --git a/content/public/browser/render_widget_host_view.h b/content/public/browser/render_widget_host_view.h
index 6d97fd898ef8fba1ae5dc1034ab169d6deddc8ee..22ec856b9fd99cb2d98f30e19b031b1752e21080 100644
--- a/content/public/browser/render_widget_host_view.h
+++ b/content/public/browser/render_widget_host_view.h
@@ -93,6 +93,12 @@ class CONTENT_EXPORT RenderWidgetHostView {
   // Whether the view is showing.
   virtual bool IsShowing() = 0;
 
+  // Indicates if the view is currently occluded and the view may be suspended.

[Avi (use Gerrit), 2015/01/16 20:15:13]

You might want to give an "e.g." for occlusion here, as that word might not be
in everyone vocabulary (and isn't even in my spellcheck).

[ccameron, 2015/01/16 21:43:40]

Done.

+  // If Show() is called on a view then its state is re-set to being
+  // un-occluded. These calls do not necessarily made in pairs.

[Avi (use Gerrit), 2015/01/16 20:15:13]

"do not necessarily made" is weird grammar; clean that up. But this is a huge
point, that these aren't nesting calls, so make that clear.

[ccameron, 2015/01/16 21:43:40]

Fixed. Also expanded on the points of being re-set.

+  virtual void WasUnOccluded() = 0;
+  virtual void WasOccluded() = 0;
+
   // Retrieve the bounds of the View, in screen coordinates.
   virtual gfx::Rect GetViewBounds() const = 0;